A Tight-Binding Investigation of the NaxCoO2 Fermi Surface

Abstract

We perform an orthogonal basis tight binding fit to an LAPW calculation of paramagnetic Na${}_x$CoO${}_2$ for several dopings. The optimal position of the apical oxygen at each doping is resolved, revealing a non-trivial dependence of the band structure and Fermi surface on oxygen height. We find that the small e${}_{g^{\prime }}$ hole pockets are preserved throughout all investigated dopings and discuss some possible reasons for the lack of experimental evidence for these Fermi sheets.

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Cited by in corpus (18)

• Maximal Rashba-like spin splitting via kinetic energy-driven inversion symmetry breaking
• Ferromagnetism, paramagnetism and a Curie-Weiss metal in an electron doped Hubbard model on a triangular lattice
• Complete d-Band Dispersion and the Mobile Fermion Scale in NaxCoO2
• Anisotropic quasiparticle renormalization in Na0.73CoO2: role of inter-orbital interactions and magnetic correlations
• Destruction of the small Fermi surfaces in Na${}_x$CoO${}_2$ by Na disorder
• Precise Control of Band Filling in NaxCoO2
• Itinerant in-plane magnetic fluctuations and many-body correlations in Na${}_x$CoO${}_2$
• Optical Properties and Correlation Effects in NaxCoO2
• Na${}_x$CoO${}_2$ in the x -> 0 Regime: Coupling of Structure and Correlation effects
• Getting back to Na_xCoO_2: spectral and thermoelectric properties
• Considerable non-local electronic correlations in strongly doped Na${}_x$CoO${}_2$
• Spin fluctuations, magnetic long-range order and Fermi surface gapping in NaxCoO2
• Electronic theory for itinerant in-plane magnetic fluctuations in Na${}_x$CoO${}_2$
• Tight-binding Hamiltonian for LaOFeAs
• Comparison of the Electronic Structures of Two Non-cuprate Layered Transition Metal Oxide Superconductors
• Interplay between magnetism and sodium vacancy ordering in NaxCoO2
• Disproportionation and Critical Interaction Strength in Na${}_x$CoO${}_2$: Concentration Dependence
• Modulated, three-directional, and polar structural instability in layered $d^1$ NaTiO${}_2$